Two thin, long, parallel wires, separated by a distance 'd' carry a current of 'i' A in the same direction. They will

Options

A. attract each other with a force of
B. repel, each other with a force of `(mu_(0)l^(2))/((2pid))`
C. attract, each other with a force of `(mu_(0)l^(2))/((2pid^(2)))`
D. repel each other with a force of `(mu_(0)l^(2))/((2pid^(2)))`

Answer

1

Explanation

The force per unit length between the two wires is
`F/1=mu_(0)/(4pi),(2i_(2))/d=(mu_(0)i^(2))/(2pid)`
The force will be attractive as current directions in both are some.